While the name suggests otherwise, I find it hard to help others when only being able to commit either this card or another, not both. I think they should have added an exception for the "commit one card to other investigator's skill tests" rule here, because this one doesn't do anything by itself.
Of course, you can commit it to your own tests to have more control over it, or instead use existing combos (which there are some, like Anything You Can Do, Better, etc.), but personally I am still disappointed not being able to pair Helping Hand with another skill as a support-committer.